Lifting-jack



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OWJN/ @Nov/wan) Patented Dec. 9, 1919.

l. A. IVIAHCHNE-R.

LIFTING JACK.

APPLICATION FILED AUGl I8, ISIS). 1,324,058.

1. A. MARCHNER.

LIFTING JACK.

APPLICATION FILED Aue. I8. I9I9.

1,324,058. A Patented Dec. 9,1919.

2 SHEETS-SHEET 2.

acks,

' reference numerals indicate like JOSEPH A. MARCHNER, 0F ATLANTIC CITY, NEW JERSEY.

LIFTInG-JACK.

Specification of Letters Patent.-

Patented Dec. 9, 1919 Application med August 1s, 191e. serial No, 318,295.

To all whom it may concern:

Be it known that I, JOSEPH A. MARGHNER, citizen of the United States, residing at Atlantic City, in the county of Atlantic and State of New Jersey, have invented certain newl and useful Improvements in Liftingof which the following is a specification.

The object of this invention is toprovide new and improved construction in lifting jacks for use in lifting vehicles.

This and other objects of this invention will be fully illustrated' in the drawings, de-

scribed in the specification and pointed out in the claims at the end thereof..

In the accompanying drawin lligur'e 1 is a side elevation o the liftlng J Fig. 2is a longitudinal cross section. of the lifting jack.

Fig. 3 1s a detail perspective view of the handle for operating the lifting jack.

Fig. 4 is a detail perspective view of the dogs for holding the extension of the jack in an elevated position.

Fig. 5 is a sectional view of the bevel gear for operating the lifting jack.

Fig. 6 is an endelevation of the'bevel pinlon operated by the handle of the llfting Jac Fig. 7 is a sectional view of the upper end.

of the lifting jack. l

.In the several figures of the drawings, like arts.

The lifting jack comprises the blaise 1 which supports the hollow standard 2. Carried` on the end of this standard tened thereto is the collar 3 having a ball race 4 provided thereon. A second collar 5 havin 'a ball race pprovided thereon is supporte lb vthe balls 7 mounted in the ball race 4. he collar 5 has the bevel gear 8 lformed thereon which meshes with thebevel pinion 9 which is pivoted on the stud 10A [carried on the collar 3. The hub of the bevel pinion has a rectangular extension 10 'formed thereon with lugs 11 and 12 at. the sides thereof.

A U-shaped bracket 13 is carriedon. the end ofthe extension crank 14. This'braeket 10 and slide o ver it inside of the lugs 11 and and suitably fas- 1s adaptedv to embrace the rectangular hub" 12. A pin 15 is thenv inserted into suitable holes rovided for this purpose in each of the. si es of theU-shaped bracket and this pm is also made to pass through a hole 16 provided in the forms a pivot around which the bracket 13 can swing on the hub 10.

en in the operative position, that is the position shown in Fig. 1, both sides of the bracket 13 embrace the full length of the hub 10 and project between the lugs 11 and 12 and the hub 10. On turning the bracket 13 b ymeans of the crank 14, the hub 10 and its p nion 9 are rotated, which in turn rotates p the-bevel gearn8 ,withV which the pinion 9 meshes.

The crank 14 -is made up of the ysections 17, 18 and 19. These sections are pivoted to each other and. are made so as tofold. over each other toshorten the length of the crank when not in use for the purpose of storing it in the tool box. The last section or link hub 10. The pin 15 thusl into the threaded center of the gear 8 to be raised or thereof.

In order to keep the upright 23 from turning with the gear,a pin 24 1s provided thereon. This pin projects out from the periphery of-the upright near the lower end thereof and engages the vertical slot 25 in the standard 2. This slot holds the upright 23 to a straight up and down movement when being raised or lowered by the gear 8.

The uprlght 23 is hollow and has an extension 26 mounted to telescope therein. This extension is notched out on two sides diametrically opposite each other with the notches 27, each having a rectangular shoulder provided at the upper end thereof. Betweenshe side of the extension 26 is the groove or slot 28. This slot has a short extension 29 at right angles thereto at the upper end lowered thereby on the rotation series of notches .27 .onone it has attained the desired height.

, right 23.

thereof. A pin 30 provided on the upper end of the upright 23 normally projects into the horizontal extension 29 of the slot 28 and locks the extension in place in the up- An expansion spring 31 is placed between the closed end of the hollow `up right 23. An expansion spring 31 1splaced 26. When the extension 26 1s contracted and locked in position, this spring 31 is normally compressed as shown in Fig. 2.

On the end of the extension 26 is mounted the saddle 32 which is brought into engagement with the member that is to be raised. The saddle 32 has a depending lug 33 provided thereon which engages with one side of the upwardly projecting lug 34 carried on the bevel gearv 8.

The jack is brou ht into operative osition by placing the ase 1 and the stan ard 2 below the member that is to be lifted. The upright and its extension with` the saddle 32 occupies its lowermost position as shown in Fig. 2 when placed ready to engage the member to be lifted. On the first movement of the bevel gear 8 by the pinion 9 through the crank 14 the lug 34 carried on the bevel gear engages the sides, of the depending spring lug 33 and turns the s addle 32 and extension 26 with it. In so doing, the horizontal slot 29 turns with the extension and brings the pin 30 which projects into it in line with the vertical slot 28.

The compression spring 31 is thus released and can expand until the saddle 32 makes contact with the member t0 be lifted. When in this position a pair of spring pressed dogs 35 and 36 engage a pair of correspondingly placed notches in the extension 26 and support the extension in the elevated position.

After the extension has thus been released and automatically placed against the member to be lifted, a further turning of the handle 14 rotates the bevel gear and in doing so gradually raises the threaded upright 23 as the threads of the gear operate on the threads of the upright.

The jack is operated in this manner until spring lug 33 offers but a slight resistance to the lug 34 as it is rotated. This resistance, however, is sufficient to give the saddle and extension a small angular turn sutiicient to move the slot 28 in line with the pin 30 as above pointed out. After this has been done the lug 34 slips under the spring lug 33 and will continue to do so revolution, that is, whenever it comes in contact with the lug during successive revolutions of the bevel gear.

The pin 30 also forms one of the pivot pins on which the spring dogs 35 and 36 are f mounted, a shorter pin 37 being provided in the upright 23 diagonally opposite to the and lift the extension 26 The at the end of each pin 30 to forni the other of the pivots for the dogs and 36. The pin 37 does not project into any slot in the extension 26.

Suitable springs 38 are wound around the pins 30 and 37 and have their outer end engage the sides of the dogs 35 and 36 as shown in Figs. 1 and 5 in order to hold these dogs yieldingly in engagement with the notches 27. j

On the raising of the jack the dogs 35 and 36 form supports for the extension 26 against which restv the rectangular shoulders of the notches 2'7.

When the jack has been lowered to its normal height, the extension 26 may be forcedl back into the hollow center of the threaded u right 23 by spreading the dogs 35 and 36 y means of the lugs 39 and 40 provided on the respectively.

The dogs are thus brought out of engagement with the shoulders of the notches 27 and the extension 26 may then be forced down against the pressure of the compression spring 31. At the end of its possible downward travel, the extension isgiven a slight turn in order to have the pin 30 engage into the horizontal extension slot 29 which prevents the extension from being forced back Land locks the extension into the upright 26 from which it is released again on the rotation of the handle or crank 14 as above described.

I claim:

1. In a lifting jack, the combination of a base, an upright mounted on said base, a collar mounted on top of said upright, a stud carried by said collar, a pinion mount/ed to rotate on said stud, a bevel gear mounted to rotate on top of said'collar and mesh with said pinion, said bevel gear having a hollow center and being provided with a female thread therein, a hollow and threaded stem being adapted to pass through said threaded center of said hollow bevel gear and being raised and'lowered thereby on the rotation ofsaid bevel'gear, an extension mounted to telescope in said threaded stem, an eXpansion spring interposed between the bottom of said extension and said stem, means to lock said spring in a compressed state between the end of said stem and said'upright, and means to release said spring on the beginning of the rotation of said bevel gear to raise said extension from said upright.

2. In a lifting jack, the combination of a base, an upright mounted on said base, a collar mounted on top of said upright, a stud carried by said collar, a pinion mounted to rotate on said stud, a bevel gear mounted to rotate on top ofisaid collar and mesh with said pinion, -said bevel gear having a hollow center and being provided with a A:female thread therein, a hollow and threaded stem sides of the dogs 35 and 36 l heilig adapted to pass through said threaded ('enter of said hollow bevel gear and being raised and lowered therebv on the rotation of said bevel gear, an extension mounted to telescope in said threaded stem, an expansion to release said spring on the beginning of the rotation of said bevel gear to raise said extension from said upright, and means carried on said stem and said extension to automatically support said extension on said stem at a predetermined position.

' In testimony whereof I afix my signature.

JOSEPH A. MARCHNER. 

